On a 1986 trooper I go out and drive it and I'm still working out bugs from
the engine rebuild. Me and a friend went and test drove it and it was fine
until the engine warmed up and then it lurched and coughed like crazy and
died altogether in the middle of the road. So we let it sit for a bit and
try it again and its fine...for another 5 mintues. We get it home and he
says its a crappy fuel pump. So I replace it and that helps alot but it
still lurches periodicly after its warmed up but not so much. Could it be
a bad O2 sensor? Help would be appreciated.